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The base unit of mass is the kilogram.
The SI unit of mass is the Kilogram.
The SI base unit for mass is the kilogram.
The base unit of mass is the kilogram.
The base unit for measuring mass is kilograms.
The base unit of mass is the kilogram, and is written kg.
The base unit of mass is the kilogram.
The SI unit of mass is the Kilogram.
The SI unit of mass is the Kilogram.
The base unit of mass is the kilogram.
If, by 'metric system', you mean 'SI system', then the base unit for mass is the kilogram
The base unit of mass is the kilogram.